Boring-machine.



G. RHINBHART.

BORING MACHINE. APPLIoATxoN FILED S3219, 1908.

Patented Dec. 29, 1908.

, simultaneously exerting a longitmlinal adjustment in block 15 by 5o entran stares rarnsr ernten.

CHARLES -RHINHARTVOF LIMA, OHIO.

` Bonino-MACHINE.

No. 907,883., Specification of Letters Patent. Patented Dec. 29, 1908.

Application ledbeptember 9, 1908. SerialNo. l52,340.

To dit i12/ion, 'it 'may concern:

Be it known that I, CHAnLEs Bumm-raar, a citizen of the United States, residing at Lima, Uien county, Ohio, have invented a new and useful improvement` in Boring- Machines, of which the `following is a specii'ication.

My invention relates to boring machines of the class adapted tothe use ol: electricians or others for use in boring through ji'sts in buildings or for other purposes, and the objects ot' my improvements are to provide means for boring holes in different angles and where the operating spaceis too limited to permit the use of an ordinary brace; to )rovide means `for turning an auger or bit an for )ressure longitudinalljr thereon; to providIe means for removably securing the device in operative position; to provide means for moving the auger bit in a straight line, and to provide simple and durable construction and assemblage ot' parts for securing facilityof operation and efficiency of action. These objects are attained in the following described Inanner as illustrated in the accompanying drawings, in which e* Figure 1 is a. front elevation of a boring machine einbodying my improvements; Fig. 2, 'a longitudinal section; Fig. 3 a plan of the guide and sliding head; Figs. 4 and 5, a front elevation and a lan respectively of the clamping jaws ant connections.

In the drawings, 1 represents a guide frame, 2 a vise block adjustably secured thereon by means oi clamps 3 and a clamping screw 4, as shown in Fig. 5. VA bar 5 formed with notches or teeth 6 and a rod 7 having a hand Wheel 8 adjustably threaded thereon are extended rearwardly from the block and .'irmiuate in a tie bar S). A jaw 11 slidably me'mted on Jsaid rod and bar is iformedwith a tooth l2 near its lower end adapted to fulcrum on one oi' the eorrcspomling teeth 6 for spindle is the hand wheel to move the jaw with its upper portieri into (damping contact with a jois 1() as shown in Fig. 2. An arm 13 rovided with a 'iuhfrum yoke 14 is se. rrr-f in means oi' the thumb screw 16 and said block is prrotaliy secur d on the Tower portion. of

the guide frame. 1 by means of a bolt 17 r whereby said aria may move in different vertical angles.

. A yoke 18 is maintained in different vertical angles ot' adjustment en the upper portion of the guide traine 1 by means oi screws 19, and the cross head 21 wherein the spindle 22 is journaled is sldably mounted thereon. Said provided with a bevel gear 23 and i'orn'ied with the usual socket or chuck 24 for the removable,engagement therewith of the shank of an auger'or bit 25. A bevel gear 26 in continuous engagement with gear 23 is removably secured to a short shaft 27 whereby'it is journaled in a bearing 28 which is carried by the cross-head 21. A shaft 29 lconnected with the shaft 27 by a toggle joint 31 is journalcd' through a handle bearing 32 and provided on its lower end with a crank 33. Said handle bearing is secured to a lever. 34 which is fulcruined at an intermediate point on yoke 14 and pivotally secured near its upp'er end to the cross head 21.

In operation, the device may be securely clam ed in the desired position on a joist or elsew 1ere, as shown in Fig. 2. The yoke 18 may be adjusted in the desired angle on the guide frame, and the spindle with the auger actuated by means of t 1e bevel gear and togglejoint connections with the crank shaft. The toggle joint in the crank shaft and also the free vertical movement of the fulcruin yoke permits the cross head to be moved 'for feeding or removing the auger in the straight line oi yoke 18 by means of the hand le .fer without binding thereon or changing the proper relative position of the gears.

Having iully described my inrprovermrnt,

what l claim as my invention and desire to secure by Letters Patent of the United States 1s:-

1. In a boring machine, the combination of a guide-frame, a clamp for securing said frame in place, a yoke pivoted to said frame, an adjustable arm also pivoted to said frame, a cross-head mounted to slide on said yoke, a bit-chuck journaled in said crosshead, a hand lever fulerumed on said arm and connected to said crosshead, a crank shaft `mounted insaid lever, and gearing for transmitting motion from ,said shaft to said chuck.

2. A boring machine comprising a clamp mechanism, s1 guide-frame secured adjustably thereto, a, yoke connected to the 'frame and mguahrly adjusmbe with respect thereto, si. Gross-head sldaby mounted on said yoke, a spinde joumaled in. said cross-head, a hand bever mnneczcd t@ said ox'oss-hen l, a, crank shaft mount lewe/r, a universal. joins in the crank shaft, in-

ed longitudinally in said' gomas termeshng gears connected to said spindle and szud crank shaft, and. an arm Conuectd l0 to smd lever md movubly connected to the 

